Photo: Robert Weldon/GIA, Dr. Eduard J. Gübelin collection. Fine-quality turquoise is sought after around the world by designers of unusual jewelry pieces. Typically, turquoise is judged on three ...
Photo: Robert Weldon/GIA, Dr. Eduard J. Gübelin collection. Fine-quality turquoise is sought after around the world by designers of unusual jewelry pieces. Typically, turquoise is judged on three ...
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